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Reports empty branches in a RegExp alternation.
An empty branch will only match the empty string, and in most cases that is not what is desired.
This inspection will not report a single empty branch at the start or the end of an alternation.
<p><b>Example:</b></p>
<pre><code>
  (alpha||bravo)
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  (alpha|bravo)
</code></pre>
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<p><small>New in 2017.2</small>
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